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Chemical characterization of a commercial Commiphora wightii resin sample and chemical profiling to assess for authenticity. PLANTA MEDICA 2011; 77:945-950. [PMID: 21240842 DOI: 10.1055/s-0030-1250674] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The gum resin of Commiphora wightii [(Hook. ex Stocks) Engl.] is an ayurvedic medicine for the treatment of arthritis, inflammation, obesity, lipid disorders, and cardiovascular diseases and is known as guggul. Morphologically, it is not easy to distinguish guggul from closely related gum resins of other plants. Reliability of the commercially available guggul is critical due to the high risk of adulteration. To check authenticity, a commercial guggul sample was investigated for its chemical markers and 17 metabolites were identified, including three new, 20(S),21-epoxy-3-oxocholest-4-ene (1), 8 β-hydroxy-3,20-dioxopregn-4,6-diene (2), and 5-(13' Z-nonadecenyl)resorcinol (17) from the ethyl acetate soluble part. During the current study, compounds 14- 17 were identified as constituents of Mangifera indica gum, as an adulterant in the commercial guggul sample. This discovery highlighted the common malpractices in the trade of medicinal raw material in the developing world. The structures of the compounds were deduced by the spectroscopic technique and chemical methods, as well as by comparison with the reported data. The structure of 20(S),21-epoxy-3-oxocholest-4-ene (1) was also unambiguously deduced by single-crystal X-ray diffraction technique.
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[RP-HPLC characteristics of dragon's blood]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 2007; 32:2025-2027. [PMID: 18161297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
OBJECTIVE To study the fingerprint of dragon's blood resina draconis by high performance liquid chromatography. METHOD The samples are extracted with methanol and separated on a Eclipse XDB-C18 column (4.6 mm x 150 mm, 5 microm) with the mobile phase of acetonitrile-H2O in gradient mode, and the flow rate was 1.0 mL x min(-1), the detection wavelength was 275 nm and the temperature of column was 40 degrees C. Loureirin B was used as the reference compound. RESULT HPLC fingerprint of dragon's blood was established and the similarity of the fingerprint was compared. CONCLUSION The method is simple, accurate, and can be used to control the quality of dragon's blood.
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Control of brittleness in butyl-methylmethacrylate resin embedding mixtures to facilitate their use in immunofluorescence microscopy. CYTOBIOS 2002; 104:145-56. [PMID: 11318510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Butyl-methylmethacrylate resin mixtures were tested for brittleness-inducing factors in polymerised resin using a rapid quantitative scoring technique. The major source of brittleness was identified as the reducing agent dithiothreitol, which is commonly included in resin mixtures at 10 mM, to protect against tissue oxidation. Lowering the dithiothreitol content to 5 mM substantially reduced brittleness. Changing the 4:1 ratio of butyl- to methylmethacrylate to 9:1 or 3:2, and reducing the concentration of the catalyst, benzoin ethyl ether, to 0.25% also reduced dithiothreitol-induced brittleness. Polymerisation at temperatures close to 0 degrees C increased dithiothreitol-induced brittleness, but this was controlled in the 4:1 and 9:1 resin mixtures by lowering the catalyst concentration from 0.5 to 0.25%. Degassing the resin mixture with nitrogen gas prior to polymerisation did not reduce brittleness. Immunolabelled onion roots which were embedded using the 3:2 resin mixture ratio, 5 mM dithiothreitol and the 0.25% catalyst concentration, showed excellent preservation of cortical microtubule arrays.
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Abstract
Paired filtration dialysis is a modified form of hemodiafiltration with a double-chamber hollow fiber. Convection is separated from diffusion, eliminating the potential risk of backfiltration (which can contain endotoxin or cytokine-inducing substances). The regeneration of high volumes of plasma ultrafiltrate obtained in the first filter allows a large plasma volume to be treated, and at the same time enables the return of many beneficial substances such as hormones, small peptides and many vitamins. Ultrafiltrate is regenerated with a charcoal-resin device and reinfused to the patient. Hemodiafiltration with on-line endogenous reinfusion is an easy and safe procedure. In addition, the method avoids risks associated with exogenous fluid infusion (endotoxin, pyrogens), allows exchange at no extra costs of large volumes of fluids and reduction in storage of fluid bags. Clinical advantages also include infusion of physiological fluid containing bicarbonate and calcium, good clinical tolerance and cardiovascular stability.
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[Quality evaluation of marketing propolis]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1986; 11:44-6. [PMID: 2943461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
Ginger is used in more ways than any other spice. This monograph, published in two parts, comprehensively reviews production, trade, processing, chemistry, and evaluation of quality. Botany, world varieties, agronomy, crop improvement, and potential are reviewed briefly with emphasis on the yield of functional components. Processing for the market, international trade patterns and factors influencing them are discussed. Derived products such as ginger powder, syruped ginger, volatile oil, and oleoresin are discussed in greater detail. The increasing world demand for quality products of added value such as the oleoresin and volatile oil show the prospects for their production in the growing countries. The chemistry of the components which contribute aroma and pungency that characterize ginger is critically reviewed. The second part deals with evaluation of quality. The physicochemical parameters prescribed as a measure of quality for ginger and its products in the existing standards, can assure only hygienic quality and purity, and possibly the source, when new parameters such as GC-finger prints are included. The importance of sensorily evaluating flavor quality is emphasized to understand the variation in flavor quality required by the industrial and retail markets. Related areas, such as problems in sensory evaluation of intense flavored substances, objective flavor profile analysis, correlation of instrumental and sensory data are discussed, and our recent work in this area is summarized. Areas where more research is needed are indicated. Other areas briefly discussed are functional, physiological, and toxicological properties in use of ginger; biosynthetic aspects of components stimulating flavor; structure and pungency and chemistry of spices from allied species and genera. A comprehensive bibliography is provided to aid in further study and research.
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A hazardous materials identification system for the coating and resins industry. AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL 1980; 41:901-7. [PMID: 7468460 DOI: 10.1080/15298668091425842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Several thousand raw materials ranging from naturally occurring minerals to highly toxic biocidal agents are employed in the manufacture of coatings and resins. The batch-type operations of this industry require employees to handle many different materials each day, so an easily recognizable and effective hazardous materials warning system is requisite. Such a system has been developed in the Coatings and Resins Division of PPG Industries and is called the "Safety and Health Index System". With this system, it is now possible for PPG employees to know the potential health, flammability and reactivity hazards associated with each bag or drum they may handle and take the necessary precautions to protect themselves.
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[Experimental studies on the sealing properties of various kind of root canal sealers and pastes in vitro, with special reference to non-eugenol preparations (author's transl)]. SHIKA GAKUHO. DENTAL SCIENCE REPORTS 1980; 80:1471-86. [PMID: 7013076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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10
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[Clinical re-examination and evaluation of removable denture with self-cured resin (author's transl)]. ZHONGHUA KOU QIANG KE ZA ZHI [CHINESE JOURNAL OF STOMATOLOGY] 1980; 15:142-5. [PMID: 6939544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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11
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["Draft standard" for resin--based dental filling materials ISO/DIS 4049 News from NOIM]. TANDLAEGEBLADET 1979; 83:90-2. [PMID: 283566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Certification program for dental materials: list of certified dental materials and devices revised to Jan 1, 1975. Council on Dental Materials and Devices. J Am Dent Assoc 1975; 90:173-80. [PMID: 1053632 DOI: 10.14219/jada.archive.1975.0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Studies on Albizia zygia gum. 3. Stabilization of emulsions. PHARMACEUTICA ACTA HELVETIAE 1973; 48:412-9. [PMID: 4729563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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[A method of testing the resinous properties of thermoplastic impression material]. PROTETYKA STOMATOLOGICZNA 1972; 22:377-84. [PMID: 4512860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Abstract
This investigation was undertaken to study the abrasion and staining resistance of denture base and veneering resins. The abrasion of certain resins was tested with specific commercial cleaning agents and dentifrices by use of natural and synthetic bristle toothbrushes and denture brushes. Staining resistance was tested by use of natural food stains on the resins. Results indicate some general guidelines for the clinical selection, use, and maintenance of dental restorations or appliances fabricated with these resins.
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Theoretical studies of dynamic creep behavior by Voight visco elastic model using exponential fluid. SHIKA RIKOGAKU ZASSHI. JOURNAL OF THE JAPAN SOCIETY FOR DENTAL APPARATUS AND MATERIALS 1971; 12:48-53. [PMID: 5292933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D), baked to gold, after dipping in particular experimental solutions. VI. Absorption and corrosion after dipping in artificial saliva acidified with lactic acid]. ARCHIVIO STOMATOLOGICO 1971; 12:65-73. [PMID: 5293338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D), baked to gold, after dipping in particular experimental solutions. X. Corrosion after dipping in ethyl alcohol]. ARCHIVIO STOMATOLOGICO 1971; 12:103-10. [PMID: 5293335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D) after dipping in particular experimental solutions. IX. Corrosion after dipping in ethyl alcohol]. ARCHIVIO STOMATOLOGICO 1971; 12:95-102. [PMID: 5293341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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A further report on the physical properties of five composite resins. II. JOURNAL - ALABAMA DENTAL ASSOCIATION 1971; 55:17-33. [PMID: 5282008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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The effect of pulpal tissues on microleakage around dental restorations. ORAL SURGERY, ORAL MEDICINE, AND ORAL PATHOLOGY 1971; 31:568-70. [PMID: 5279029 DOI: 10.1016/0030-4220(71)90353-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D) after dipping in particular experimental solutions. VII. Absorption and corrosion after dipping in artificial saliva acidified with butyric acid]. ARCHIVIO STOMATOLOGICO 1971; 12:75-84. [PMID: 5293339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D) after dipping in particular experimental solutions. 3. Absorption and corrosion after dipping in artificial saliva acidified with acetic acid]. ARCHIVIO STOMATOLOGICO 1971; 12:23-31. [PMID: 5293330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D) after dipping in particular experimental solutions. V. Absorption and corrosion after dipping in artificial saliva acidified with lactic acid]. ARCHIVIO STOMATOLOGICO 1971; 12:55-64. [PMID: 5293334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D), baked to gold, after dipping in particular experimental solutions. IV. Absorption and corrosion after dipping in artificial saliva acidified with acetic acid]. ARCHIVIO STOMATOLOGICO 1971; 12:45-53. [PMID: 5293333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[Behavior of a synthetic resin (Diamon-D) after dipping in particular experimental solutions. I. Absorption and corrosion after dipping in potassium sulfocyanate added to artificial saliva]. ARCHIVIO STOMATOLOGICO 1971; 12:3-12. [PMID: 5293332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Abstract
Development of elastomeric polyurethane resins for use as adhesive liners under composite restorative materials is reviewed. The elastic nature of these adhesive films appears to provide a marginal seal despite dimensional changes of the restorative material. Adhesive strengths of 1,500 psi to enamel have been maintained after thermal cycling and after storage for one year in water.
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Abstract
Development and laboratory evaluation of a thermosetting polyurethane resin designed for use as a pit and fissure sealant was conducted. The material exhibited adhesion to enamel in excess of 1,300 psi. Radioautographs and scanning electron photomicrographs did not indicate leakage of isotope and showed an intimate contact between the resin and the fissure walls. The resin appeared to penetrate into the deepest fissures. The material is hydrolysis resistant; 90% of the original adhesive strength was retained after one year in 37 C water.
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[Behavior of a synthetic resin (Diamon-D), baked to gold, after dipping particular experimental solutions. II. Absorption and corrosion after dipping in potassium sulfocyanate added to artificial saliva]. ARCHIVIO STOMATOLOGICO 1971; 12:13-22. [PMID: 5293329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[New restorative material: "composite resins" 1. Composition, indications for and technic of utilization]. REVISTA DA ASSOCIACAO PAULISTA DE CIRURGIOES DENTISTAS 1970; 24:112-21. [PMID: 5272729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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[On the physical chemical properties of the 3M Addent products]. DEUTSCHE ZAHNARZTLICHE ZEITSCHRIFT 1969; 24:529-39. [PMID: 5254382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Physical properties of synthetic resin baseplate materials. I. Thermo-softening blanks. Aust Dent J 1969; 14:124-30. [PMID: 5254303 DOI: 10.1111/j.1834-7819.1969.tb04291.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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